Linux - iptables

# Install
yum install -y iptables       # 安装iptables
yum install iptables-services # 安装iptables-services
yum update iptables           # 升级iptables

# Check status
service iptables status       # CentOS6
systemctl status iptables     # CentOS7

# Auto start
chkconfig iptables on               # CentOS6
systemctl enable iptables.service   # CentOS7

# 开放指定端口
iptables -A INPUT -p tcp --dport 4022 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j ACCEPT
iptables -A INPUT -p tcp --dport 8087 -j ACCEPT